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- MYSLIWIEC, Grzegorz. Techniki i triki negocjacyjne. Warszawa : EFEKT, 1999. 136 s. ISBN 83-87338-08-7. [Copy count : 1, currently available 1, at library only 0]
book
- 1993 ,č.1-12. Obchod. Kontakt. Marketing. Praha : Efekt, 1993. 1 zv. mesačník. ISSN 1210-4531 [Copy count : 1, currently available 0, at library only 1]
journal
- 1992 ,č. 1-12. Obchod - kontakt. Praha : Efekt, 1992. 1 zv. mesačník. ISSN 1210-0609 [Copy count : 1, currently available 0, at library only 1]
journal
journal